First in a series of “bread & butter” comping patterns for slow triple-feel blues…
As always, the defining feature of slow triple-feel blues is the laid-back “three-ness” that underlies every beat.
This pattern consists of “the 1-3-5-6 thing” in the left hand with the definitive tones (3 & b7) of each of the big 3 chords in the right…

Hint: Don’t be in a hurry and don’t try to force the rhythm. Simply allow the triplets (which you hear and feel as the relentless Tik-tik-tik Tik-tik-tik Tik-tik-tik Tik-tik-tik on the hi-hats) to take both hands along for a super chill stroll…